Conduit-grounding bushing



Sept. 17, 1929. w H VIBBER 1,728,280

CONDUIT GROUNDING BUSHING Filed April 1925 M iiiiiiiliiiiiiiiillill IIllllllll'lllllllllllllii'lfi' /ZMJWM Patented Sept. 17, 1929 UNITEDSTATES PATENT OFFICE WHEELER H. VIBBER, OF NEW LONDON, CONNECTICUT,ASSIGNOR OF ONE-HALF TO 'TEE GILLETTE-VIBE 60., 01 NEW LONDON,CONNECTICUT, A. CORPORATION CONDUIT-GBOUNDING BUSHING Application fledApril 3, 1925. Serial 110. 20,385.

My invention relates to an improved conduit-grounding bushing, theobject being to produce a bushing adapted to be simply and eflectivelylocked upon the conduit and to provide means for onding and groundingthe same.

With these ends in view, my invention consists in a conduit-groundingbushing, having certain details of construction as will be hereinafterdescribed and pointed out in the claim.

The accompanying drawings represent in Fig. 1 a top or plan view of aconduitgrounding bushing embodying my invention.

Fig. 2 a side view thereof.

Fig. 3 a view thereof in .central section, showmg its application to aconduit, which is shown in broken lines.

In carrying out my invention, as shown in Figs. 1 to 3 inclusive, Iemplo an annular 2 bushing 5 having a concentric, inwardl turned flange6 at its outer end, and interna y threaded to adapt it to be screwedover the.

threaded end of'a standard conduit 7. The

said bushin is formed with an integral, radially-extending ear 8, and isvirtually bisected,

as well as its said ear, by a slot 9 located in its plane andintersecting its internally-threaded portion, the said slot all butsevering the bushing, the two complementary members of which are unitedat a point diametrically opposite the said ear 8 by a web 10 forming, as

1t were, an elastic hinge. The said ear is formed with a bore 11 for thereception of the shank 12 of a clamping-screw, the polygonal head 13 ofwhich is formed with a socket 14 into which one end of a grounding orbonding wire may be inserted and soldered.

The upper portion of the bore 11 is large enough to permit the freepassage of the.

screw-shank 12, while its lower portion is threaded for e gementthereby.

It will be readlly understood that after such .a bushing as described isapplied to a conduitipe, it may be rmanently locked thereupon y thescrew w ich draws its two main parts together, so as to cramp it uponthe threads of the conduit.

The opening of the annular flange 6 in the outer member of the bushingwill substantial- 1y correspond in diameter to the internal diextendedto form an annular flange projecting inwardly so as to overhang thecircular passage through the fixture and each ring being a formed at apoint opposite the said web with an integral ear, of which that of theinner ring is provided with a threaded bore and that of the outer ringwith a corresponding threadless bore; and a combinedclampingand-grounding screw installed in the said ears for seating theoverhanging flange of the outer ring upon the end of the conduit forsecuring a close electrical union therewith.

In testimony whereof, I have signed this specification.

WHEELER H. VIBBER.

